Optical Glass X-cube Dichroic Cube Prism RGB Combiner Splitter Teaching Tool 12.7*12.7MM It can be used as both a teaching tool and a research and decoration, very beautiful. -Optical glass RGB prisms have four types of light. White light is incident on any illuminating surface and emits three primary colors, namely red, green, and blue, from the remaining three types of light, known as tricolor light. -This is very light. That is to say, the three types of light from red, green, and blue are basic light, and the one from the remaining surface emits white light, which is light. -This is one of the most important accessories on a projector. The projector can cast shadows of colors on the screen. You should know what color of light is composed of the three primary colors on the screen, and prisms with important colors are composed of the three primary colors.